﻿<!DOCTYPE html>
<html>
<head>
  <title>Table Layout</title>
  <!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
  <meta name="description" content="Use the TableLayout extension to arrange nodes in a tabular or grid-like form." />
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <script src="../release/go.js"></script>
  <script src="../assets/js/goSamples.js"></script>  <!-- this is only for the GoJS Samples framework -->
  <script src="TableLayout.js"></script>

  <script id="code">
    // define a custom ResizingTool to limit how far one can shrink a row or column
    function LaneResizingTool() {
      go.ResizingTool.call(this);
    }
    go.Diagram.inherit(LaneResizingTool, go.ResizingTool);

    LaneResizingTool.prototype.computeMinSize = function() {
      var diagram = this.diagram;
      var lane = this.adornedObject.part;  // might be row or column
      var horiz = (lane.category === "Column Header");  // or "Row Header"
      var margin = diagram.nodeTemplate.margin;
      var bounds = new go.Rect();
      diagram.findTopLevelGroups().each(function(g) {
        if (horiz ? (g.column === lane.column) : (g.row === lane.row)) {
          var b = diagram.computePartsBounds(g.memberParts);
          if (b.isEmpty()) return;  // nothing in there?  ignore it
          b.unionPoint(g.location);  // keep any empty space on the left and top
          b.addMargin(margin);  // assume the same node margin applies to all nodes
          if (bounds.isEmpty()) {
            bounds = b;
          } else {
            bounds.unionRect(b);
          }
        }
      });

      // limit the result by the standard value of computeMinSize
      var msz = go.ResizingTool.prototype.computeMinSize.call(this);
      if (bounds.isEmpty()) return msz;
      return new go.Size(Math.max(msz.width, bounds.width), Math.max(msz.height, bounds.height));
    };

    LaneResizingTool.prototype.resize = function(newr) {
      var lane = this.adornedObject.part;
      var horiz = (lane.category === "Column Header");
      var lay = this.diagram.layout;  // the TableLayout
      if (horiz) {
        var col = lane.column;
        var coldef = lay.getColumnDefinition(col);
        coldef.width = newr.width;
      } else {
        var row = lane.row;
        var rowdef = lay.getRowDefinition(row);
        rowdef.height = newr.height;
      }
      lay.invalidateLayout();
    };
    // end LaneResizingTool class

    function init() {
      if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this
      var $ = go.GraphObject.make;

      myDiagram =
        $(go.Diagram, "myDiagramDiv",
          {
            layout: $(TableLayout,
              $(go.RowColumnDefinition, { row: 1, height: 22 }),  // fixed size column headers
              $(go.RowColumnDefinition, { column: 1, width: 22 }) // fixed size row headers
            ),
            "SelectionMoved": function(e) { e.diagram.layoutDiagram(true); },
            "resizingTool": new LaneResizingTool(),
            // feedback that dropping in the background is not allowed
            mouseDragOver: function(e) { e.diagram.currentCursor = "not-allowed"; },
            // when dropped in the background, not on a Node or a Group, cancel the drop
            mouseDrop: function(e) { e.diagram.currentTool.doCancel(); },
            "animationManager.isInitial": false,
            "undoManager.isEnabled": true
          });

      myDiagram.nodeTemplateMap.add("Header",  // an overall table header, at the top
        $(go.Part, "Auto",
          {
            row: 0, column: 1, columnSpan: 9999,
            stretch: go.GraphObject.Horizontal,
            selectable: false, pickable: false
          },
          $(go.Shape, { fill: "transparent", strokeWidth: 0 }),
          $(go.TextBlock, { alignment: go.Spot.Center, font: "bold 12pt sans-serif" },
            new go.Binding("text"))
        ));

      myDiagram.nodeTemplateMap.add("Sider",  // an overall table header, on the left side
        $(go.Part, "Auto",
          {
            row: 1, rowSpan: 9999, column: 0,
            stretch: go.GraphObject.Vertical,
            selectable: false, pickable: false
          },
          $(go.Shape, { fill: "transparent", strokeWidth: 0 }),
          $(go.TextBlock, { alignment: go.Spot.Center, font: "bold 12pt sans-serif", angle: 270 },
            new go.Binding("text"))
        ));

      myDiagram.nodeTemplateMap.add("Column Header",  // for each column header
        $(go.Part, "Spot",
          {
            row: 1, rowSpan: 9999, column: 2,
            minSize: new go.Size(100, NaN),
            stretch: go.GraphObject.Fill,
            movable: false,
            resizable: true,
            resizeAdornmentTemplate:
              $(go.Adornment, "Spot",
                $(go.Placeholder),
                $(go.Shape,  // for changing the length of a lane
                  {
                    alignment: go.Spot.Right,
                    desiredSize: new go.Size(7, 50),
                    fill: "lightblue", stroke: "dodgerblue",
                    cursor: "col-resize"
                  })
              )
          },
          new go.Binding("column", "col"),
          $(go.Shape, { fill: null },
            new go.Binding("fill", "color")),
          $(go.Panel, "Auto",
            { // this is positioned above the Shape, in row 1
              alignment: go.Spot.Top, alignmentFocus: go.Spot.Bottom,
              stretch: go.GraphObject.Horizontal,
              height: myDiagram.layout.getRowDefinition(1).height
            },
            $(go.Shape, { fill: "transparent", strokeWidth: 0 }),
            $(go.TextBlock,
              {
                font: "bold 10pt sans-serif", isMultiline: false,
                wrap: go.TextBlock.None, overflow: go.TextBlock.OverflowEllipsis
              },
              new go.Binding("text"))
          )
        ));

      myDiagram.nodeTemplateMap.add("Row Sider",  // for each row header
        $(go.Part, "Spot",
          {
            row: 2, column: 1, columnSpan: 9999,
            minSize: new go.Size(NaN, 100),
            stretch: go.GraphObject.Fill,
            movable: false,
            resizable: true,
            resizeAdornmentTemplate:
              $(go.Adornment, "Spot",
                $(go.Placeholder),
                $(go.Shape,  // for changing the breadth of a lane
                  {
                    alignment: go.Spot.Bottom,
                    desiredSize: new go.Size(50, 7),
                    fill: "lightblue", stroke: "dodgerblue",
                    cursor: "row-resize"
                  })
              )
          },
          new go.Binding("row"),
          $(go.Shape, { fill: null },
            new go.Binding("fill", "color")),
          $(go.Panel, "Auto",
            { // this is positioned to the left of the Shape, in column 1
              alignment: go.Spot.Left, alignmentFocus: go.Spot.Right,
              stretch: go.GraphObject.Vertical, angle: 270,
              height: myDiagram.layout.getColumnDefinition(1).width
            },
            $(go.Shape, { fill: "transparent", strokeWidth: 0 }),
            $(go.TextBlock,
              {
                font: "bold 10pt sans-serif", isMultiline: false,
                wrap: go.TextBlock.None, overflow: go.TextBlock.OverflowEllipsis
              },
              new go.Binding("text"))
          )
        ));

      myDiagram.nodeTemplate =  // for regular nodes within cells (groups); you'll want to extend this
        $(go.Node, "Auto",
          { width: 100, height: 50, margin: 4 },  // assume uniform Margin, all around
          new go.Binding("row"),
          new go.Binding("column", "col"),
          $(go.Shape, { fill: "white" },
            new go.Binding("fill", "color")),
          $(go.TextBlock,
            new go.Binding("text", "key"))
        );

      myDiagram.groupTemplate =  // for cells
        $(go.Group, "Auto",
          {
            layerName: "Background",
            stretch: go.GraphObject.Fill,
            selectable: false,
            computesBoundsAfterDrag: true,
            computesBoundsIncludingLocation: true,
            handlesDragDropForMembers: true,  // don't need to define handlers on member Nodes and Links
            mouseDragEnter: function(e, group, prev) { group.isHighlighted = true; },
            mouseDragLeave: function(e, group, next) { group.isHighlighted = false; },
            mouseDrop: function(e, group) {
              // if any dropped part wasn't already a member of this group, we'll want to let the group's row
              // column allow themselves to be resized automatically, in case the row height or column width
              // had been set manually by the LaneResizingTool
              var anynew = e.diagram.selection.any(function(p) { return p.containingGroup !== group; });
              // Don't allow headers/siders to be dropped
              var anyHeadersSiders = e.diagram.selection.any(function(p) {
                return p.category === "Column Header" || p.category === "Row Sider";
              });
              if (!anyHeadersSiders && group.addMembers(e.diagram.selection, true)) {
                if (anynew) {
                  e.diagram.layout.getRowDefinition(group.row).height = NaN;
                  e.diagram.layout.getColumnDefinition(group.column).width = NaN;
                }
              } else {  // failure upon trying to add parts to this group
                e.diagram.currentTool.doCancel();
              }
            }
          },
          new go.Binding("row"),
          new go.Binding("column", "col"),
          // the group is normally unseen -- it is completely transparent except when given a color or when highlighted
          $(go.Shape,
            {
              fill: "transparent", stroke: "transparent",
              strokeWidth: myDiagram.nodeTemplate.margin.left,
              stretch: go.GraphObject.Fill
            },
            new go.Binding("fill", "color"),
            new go.Binding("stroke", "isHighlighted", function(h) { return h ? "red" : "transparent"; }).ofObject()),
          $(go.Placeholder,
            { // leave a margin around the member nodes of the group which is the same as the member node margin
              alignment: (function(m) { return new go.Spot(0, 0, m.top, m.left); })(myDiagram.nodeTemplate.margin),
              padding: (function(m) { return new go.Margin(0, m.right, m.bottom, 0); })(myDiagram.nodeTemplate.margin)
            })
        );

      myDiagram.model = new go.GraphLinksModel([
        // headers
        { key: "Header", text: "Vacation Procedures", category: "Header" },
        { key: "Sider", text: "Personnel", category: "Sider" },
        // column and row headers
        { key: "Request", text: "Request", col: 2, category: "Column Header" },
        { key: "Approval", text: "Approval", col: 3, category: "Column Header" },
        { key: "Employee", text: "Employee", row: 2, category: "Row Sider" },
        { key: "Manager", text: "Manager", row: 3, category: "Row Sider" },
        { key: "Administrator", text: "Administrator", row: 4, category: "Row Sider" },
        // cells, each a group assigned to a row and column
        { key: "EmpReq", row: 2, col: 2, isGroup: true, color: "lightyellow" },
        { key: "EmpApp", row: 2, col: 3, isGroup: true, color: "lightgreen" },
        { key: "ManReq", row: 3, col: 2, isGroup: true, color: "lightgreen" },
        { key: "ManApp", row: 3, col: 3, isGroup: true, color: "lightyellow" },
        { key: "AdmReq", row: 4, col: 2, isGroup: true, color: "lightyellow" },
        { key: "AdmApp", row: 4, col: 3, isGroup: true, color: "lightgreen" },
        // nodes, each assigned to a group/cell
        { key: "Delta", color: "orange", size: "100 100", group: "EmpReq" },
        { key: "Epsilon", color: "coral", size: "100 50", group: "EmpReq" },
        { key: "Zeta", color: "tomato", size: "50 70", group: "ManReq" },
        { key: "Eta", color: "coral", size: "50 50", group: "ManApp" },
        { key: "Theta", color: "tomato", size: "100 50", group: "AdmApp" }
      ]);

      myPalette =
        $(go.Palette, "myPaletteDiv",
          {
            nodeTemplateMap: myDiagram.nodeTemplateMap,
            "model.nodeDataArray": [
              { key: "Alpha", color: "orange" },
              { key: "Beta", color: "tomato" },
              { key: "Gamma", color: "goldenrod" }
            ]
          });
    }
  </script>
</head>
<body onload="init()">
<div id="sample">
  <div style="width: 100%; display: flex; justify-content: space-between">
    <div id="myPaletteDiv" style="width: 120px; height: 600px; margin-right: 2px; border: solid 1px black"></div>
    <div id="myDiagramDiv" style="flex-grow: 1; height: 600px; border: solid 1px black"></div>
  </div>
  <p>
  This sample demonstrates a custom Layout, TableLayout, that is very much like a simplified "Table" Panel layout,
  but working on non-Link Parts in a Diagram or a Group rather than on GraphObjects in a Panel.
  The layout is defined in its own file, as <a href="TableLayout.js">TableLayout.js</a>.
  </p>
  <p>
  You can drag-and-drop nodes from the Palette into any Group.
  Dragging into a Group highlights the Group.
  Drops must occur inside Groups; otherwise the action is cancelled.
  </p>
  <p>
  Each row and each column is <a>Part.resizable</a> and has a custom <a>Part.resizeAdornmentTemplate</a>
  showing a single resize handle on the right side or on the bottom.
  There is a custom LaneResizingTool to provide a minimum width or height based on the contents of all of the
  groups (cells) in that column or row.
  </p>
  <p>
  This example assumes the Groups are predefined and exist in each cell at a particular row/column,
  but this sample could be extended to allow adding and removing rows and/or columns.
  </p>
</div>
</body>
</html>